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    <td rowspan=2><h1 class="pagetitle">Frequencies</h1>
    <b><a href="../../../misc/suppkey.htm">Support Key:</a></b>
    [<b><i class="fs">CSS2</i></b>|<b class="s">CSS2.1</b>]<br></td>
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<dl>
<dt><big><b class="mainheading">What is it?</b></big>
    <dd>Frequencies are used with <a href="../../propindex/aural.htm">Aural CSS
        properties</a> to indicate the frequency of a sound effect for a page.
        Frequencies are given as a number followed by a frequency unit. Values
        cannot be negative.
</dl>

<dl>
<dt><big><b class="mainheading">Frequency Units in CSS</b></big>
<dt><b class="subheading">Hz</b>
<dt>[<b><i class="fs">CSS2</i></b>|<b class="s">CSS2.1</b>]
    <dd><b class="l3heading">Description:</b><br>Hertz. A basic unit of sound wave
        frequency. 1 Hertz = 1 cycle per second.

<dt><b class="subheading">kHz</b>
<dt>[<b><i class="fs">CSS2</i></b>|<b class="s">CSS2.1</b>]
    <dd><b class="l3heading">Description:</b><br>Kilohertz. 1 Kilohertz = One
        thousand Hertz.
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<dt><big><b class="mainheading">Examples</b></big>
    <dd><div class="example"><b class="selector">strong</b> { <span class="property">pitch:</span> 75hz }</div>
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